html, body
  margin: 0
  padding: 0
  width: 100%
  height: 100%
body
 // 背景图写绝对路径
  background-image: url('/src/assets/images/t01e804a00ef4dfa972.jpg')
  background-size: cover
  background-position: center
  font: 14px
  color: #4d4d4d
  font-weight: 300
